cgit.c (view raw)
1/* cgit.c: cgi for the git scm
2 *
3 * Copyright (C) 2006 Lars Hjemli
4 *
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
7 */
8
9#include "cgit.h"
10
11const char cgit_version[] = CGIT_VERSION;
12
13
14static struct repoinfo *cgit_get_repoinfo(char *url)
15{
16 int i;
17 struct repoinfo *repo;
18
19 for (i=0; i<cgit_repolist.count; i++) {
20 repo = &cgit_repolist.repos[i];
21 if (!strcmp(repo->url, url))
22 return repo;
23 }
24 return NULL;
25}
26
27
28static int cgit_prepare_cache(struct cacheitem *item)
29{
30 if (!cgit_query_repo) {
31 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
32 item->ttl = cgit_cache_root_ttl;
33 return 1;
34 }
35 cgit_repo = cgit_get_repoinfo(cgit_query_repo);
36 if (!cgit_repo) {
37 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
38 cgit_print_docstart(title, item);
39 cgit_print_pageheader(title, 0);
40 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
41 cgit_print_docend();
42 return 0;
43 }
44
45 if (!cgit_query_page) {
46 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
47 cgit_repo->url));
48 item->ttl = cgit_cache_repo_ttl;
49 } else {
50 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
51 cgit_repo->url, cgit_query_page,
52 cache_safe_filename(cgit_querystring)));
53 if (cgit_query_has_symref)
54 item->ttl = cgit_cache_dynamic_ttl;
55 else if (cgit_query_has_sha1)
56 item->ttl = cgit_cache_static_ttl;
57 else
58 item->ttl = cgit_cache_repo_ttl;
59 }
60 return 1;
61}
62
63static void cgit_print_repo_page(struct cacheitem *item)
64{
65 char *title;
66 int show_search;
67
68 if (!cgit_query_head)
69 cgit_query_head = cgit_repo->defbranch;
70
71 if (chdir(cgit_repo->path)) {
72 title = fmt("%s - %s", cgit_root_title, "Bad request");
73 cgit_print_docstart(title, item);
74 cgit_print_pageheader(title, 0);
75 cgit_print_error(fmt("Unable to scan repository: %s",
76 strerror(errno)));
77 cgit_print_docend();
78 return;
79 }
80
81 title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
82 show_search = 0;
83 setenv("GIT_DIR", cgit_repo->path, 1);
84
85 if (cgit_query_page) {
86 if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
87 cgit_print_snapshot(item, cgit_query_sha1, "zip",
88 cgit_repo->url, cgit_query_name);
89 return;
90 }
91 if (!strcmp(cgit_query_page, "blob")) {
92 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
93 return;
94 }
95 }
96
97 if (cgit_query_page && !strcmp(cgit_query_page, "log"))
98 show_search = 1;
99
100 cgit_print_docstart(title, item);
101
102
103 if (!cgit_query_page) {
104 cgit_print_pageheader("summary", show_search);
105 cgit_print_summary();
106 cgit_print_docend();
107 return;
108 }
109
110 cgit_print_pageheader(cgit_query_page, show_search);
111
112 if (!strcmp(cgit_query_page, "log")) {
113 cgit_print_log(cgit_query_head, cgit_query_ofs,
114 cgit_max_commit_count, cgit_query_search,
115 cgit_query_path);
116 } else if (!strcmp(cgit_query_page, "tree")) {
117 cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
118 } else if (!strcmp(cgit_query_page, "commit")) {
119 cgit_print_commit(cgit_query_head);
120 } else if (!strcmp(cgit_query_page, "view")) {
121 cgit_print_view(cgit_query_sha1, cgit_query_path);
122 } else if (!strcmp(cgit_query_page, "diff")) {
123 cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
124 cgit_query_path);
125 } else {
126 cgit_print_error("Invalid request");
127 }
128 cgit_print_docend();
129}
130
131static void cgit_fill_cache(struct cacheitem *item, int use_cache)
132{
133 static char buf[PATH_MAX];
134 int stdout2;
135
136 getcwd(buf, sizeof(buf));
137 item->st.st_mtime = time(NULL);
138
139 if (use_cache) {
140 stdout2 = chk_positive(dup(STDOUT_FILENO),
141 "Preserving STDOUT");
142 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
143 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
144 }
145
146 if (cgit_query_repo)
147 cgit_print_repo_page(item);
148 else
149 cgit_print_repolist(item);
150
151 if (use_cache) {
152 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
153 chk_positive(dup2(stdout2, STDOUT_FILENO),
154 "Restoring original STDOUT");
155 chk_zero(close(stdout2), "Closing temporary STDOUT");
156 }
157
158 chdir(buf);
159}
160
161static void cgit_check_cache(struct cacheitem *item)
162{
163 int i = 0;
164
165 top:
166 if (++i > cgit_max_lock_attempts) {
167 die("cgit_refresh_cache: unable to lock %s: %s",
168 item->name, strerror(errno));
169 }
170 if (!cache_exist(item)) {
171 if (!cache_lock(item)) {
172 sleep(1);
173 goto top;
174 }
175 if (!cache_exist(item)) {
176 cgit_fill_cache(item, 1);
177 cache_unlock(item);
178 } else {
179 cache_cancel_lock(item);
180 }
181 } else if (cache_expired(item) && cache_lock(item)) {
182 if (cache_expired(item)) {
183 cgit_fill_cache(item, 1);
184 cache_unlock(item);
185 } else {
186 cache_cancel_lock(item);
187 }
188 }
189}
190
191static void cgit_print_cache(struct cacheitem *item)
192{
193 static char buf[4096];
194 ssize_t i;
195
196 int fd = open(item->name, O_RDONLY);
197 if (fd<0)
198 die("Unable to open cached file %s", item->name);
199
200 while((i=read(fd, buf, sizeof(buf))) > 0)
201 write(STDOUT_FILENO, buf, i);
202
203 close(fd);
204}
205
206static void cgit_parse_args(int argc, const char **argv)
207{
208 int i;
209
210 for (i = 1; i < argc; i++) {
211 if (!strncmp(argv[i], "--cache=", 8)) {
212 cgit_cache_root = xstrdup(argv[i]+8);
213 }
214 if (!strcmp(argv[i], "--nocache")) {
215 cgit_nocache = 1;
216 }
217 if (!strncmp(argv[i], "--query=", 8)) {
218 cgit_querystring = xstrdup(argv[i]+8);
219 }
220 if (!strncmp(argv[i], "--repo=", 7)) {
221 cgit_query_repo = xstrdup(argv[i]+7);
222 }
223 if (!strncmp(argv[i], "--page=", 7)) {
224 cgit_query_page = xstrdup(argv[i]+7);
225 }
226 if (!strncmp(argv[i], "--head=", 7)) {
227 cgit_query_head = xstrdup(argv[i]+7);
228 cgit_query_has_symref = 1;
229 }
230 if (!strncmp(argv[i], "--sha1=", 7)) {
231 cgit_query_sha1 = xstrdup(argv[i]+7);
232 cgit_query_has_sha1 = 1;
233 }
234 if (!strncmp(argv[i], "--ofs=", 6)) {
235 cgit_query_ofs = atoi(argv[i]+6);
236 }
237 }
238}
239
240int main(int argc, const char **argv)
241{
242 struct cacheitem item;
243
244 htmlfd = STDOUT_FILENO;
245 item.st.st_mtime = time(NULL);
246 cgit_repolist.length = 0;
247 cgit_repolist.count = 0;
248 cgit_repolist.repos = NULL;
249
250 cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
251 if (getenv("SCRIPT_NAME"))
252 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
253 if (getenv("QUERY_STRING"))
254 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
255 cgit_parse_args(argc, argv);
256 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
257 if (!cgit_prepare_cache(&item))
258 return 0;
259 if (cgit_nocache) {
260 cgit_fill_cache(&item, 0);
261 } else {
262 cgit_check_cache(&item);
263 cgit_print_cache(&item);
264 }
265 return 0;
266}